IEEE C802.16j-08/001
Project / IEEE 802.16 Broadband Wireless Access Working Group <Title / Clarification ofTLVs for routing
Date Submitted / 2008-01-08
Source(s) / Kanchei (Ken) Loa, Chun-Yen Hsu,
Yi-Hsueh Tsai,Yung-Ting Lee,
Hua-Chiang Yin,Shiann-Tsong Sheu,
Youn-Tai Lee
Institute for Information Industry
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Re: / IEEE 802.16j-07/059: “IEEE 802.16 Working Group Letter Ballot Recirc #28a: Announcement”
Abstract / This contribution clarifies routing TLVs
Purpose / Text proposal for 802.16j Draft Document
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Clarification of TLVs for Routing
Kanchei (Ken) Loa, Chun-Yen Hsu,Yi-Hsueh Tsai, Yung-Ting Lee,Hua-Chiang Yin, Shiann-Tsong Sheu,Youn-Tai Lee
Institute for Information Industry
Introduction
In subclause 11.23ofIEEE P802.16j/D2, several TLVs for routing are defined. However, some of them are redundant or not used at all, and could be removed.
We propose to remove the following TLVs.
Path-CID-Binding-Removal TLV
The Path-CID-Binding-Removal TLV could be replaced with the Path-CID-Binding-Update TLV. If the MR-BS intends to remove a binding between a CID and a path, it could send a DSD-REQ with the Path-CID-Binding-Update TLV along the path.
Path direction
IEEE 802.16j does not support asymmetric path. There is no need to specify/record the direction of a path here.
Number-of-RS TLV
The number of RSs attached in the TLV can be derived from the length of the respective TLV.
Existing path ID TLV
In IEEE P802.16j/D2, the Existing path ID TLV was used to indicate the reference path of a new path. In case the Existing path ID TLV is present, the Ordered list of RSs field records the difference between the old and new path. However, the usage for this TLV is not clear. Specifying the list of RSs along the path is a simple and robust way in creating a new path. Therefore the Existing path ID TLV could be removed.
Path-Info TLV
The Path-Info TLV is not referenced anywhere else in IEEE P802.16j/D2.
In order to facilitate the incorporation of this proposal into IEEE 802.16j standard, specific changes to the draftstandardP802.16j/D2 are listed below.
Spec changes :
[ModifyPage 33, Line 35-43 as follows.]
The DSD-REQ message sent over relay link for the purpose of path management may contain the following TLVs:
Path ID (see 11.1.13.1)
Specification of the path to be completely removed
Path CID Binding Update Removal(see 11.23.3)(see 11.1.13.3)
Specification of the path/cid binding operations including removing the binding between CIDs to the specific path.
[Remove subclause 11.23]
[Insert new subclause 11.1.13]
11.1.13 Path management message encodings
The TLV encodings defined in this section are specific to the path management related MAC Managementmessages.
[Insert new subclause 11.1.13.1]
11.1.13.1 PathID encoding
Type / Length / Value / Scope150 / 2 / ID of path / DSx-REQ, DSx-RSP,
DSx-ACK
[Insert new subclause 11.1.13.2]
11.23.2 PathAddition TLV
Name / Type / Length / Value / ScopePathAddition / 131 / Variable / Path ID(unsigned 16-bit)
Ordered list ofRSs (variable) / DSA-REQ, RNG-RSP
OrderedListofRSs
The ordered list of RSs’ basic CIDs along the path in the downstream direction. The upstream direction list can be obtained by reverse this ordered list.
[Insert new subclause 11.1.13.3]
11.1.13.3 PathCIDBindingUpdate TLV
Name / Type / Length / Value / ScopePathCIDBindingUpdate / 130 / Variable / Path ID (unsigned 16-bit)
List of CIDs (variable) / DSA-REQ, DSD-REQ,
RNG-RSP
Listof CIDs
A list of CIDs involved in the binding update operation.